Among the talks planned so far are about RandR 1.3, the open-source Nouveau driver, multimedia (audio) extensions for the X Server, GPU power management, r600_demo, LLVM + Gallium3D, and shader compiler optimization strategies.
There still is, however, room for a few more talks. Hopefully an Intel employee (say Keith Packard) will talk about the Graphics Execution Manager, kernel mode-setting, or another exciting X topic. We would also hope for another update about Gallium3D by Tungsten Graphics.
The current schedule of X.Org talks during FOSDEM 2009 can be found on the X.Org Wiki. Stay tuned to Phoronix for coverage of FOSDEM.